Can a stored procedure like this be SQL injected? ASP VBScript

Can anyone tell me if my stored procedure can be hit by SQL injection.  Here is one example:

On the database:
ALTER PROCEDURE [dbo].[usp_ValidateLogin]
      -- Add the parameters for the stored procedure here
      @shipper nvarchar(10),
      @password nvarchar(800),
      @email nvarchar(800) OUTPUT
AS
BEGIN
      
      DECLARE @isFirstLogin Int  --Return Value
      SET @isFirstLogin = -1
      
      -- SET NOCOUNT ON added to prevent extra result sets from
      -- interfering with SELECT statements.
      SET NOCOUNT ON;

    SELECT
            @isFirstLogin = isFirstLogin,
            @email = email
      FROM tbl_Registered_Users
      WHERE shipper = @shipper AND Password = @password
      
      RETURN @isFirstLogin

END


And here's how its being called via ASP.
      set cmdLogin = Server.CreateObject("ADODB.Command")
      With cmdLogin
            .ActiveConnection = dbConnLogin
            .CommandText = "usp_ValidateLogin"
            .CommandType = adCmdStoredProc
            .Parameters.Append .CreateParameter("RETURN_VALUE", adInteger, adParamReturnValue)
            .Parameters.Append .CreateParameter("@shipper", adVarWChar, adParamInput,10, shipperID)
            .Parameters.Append .CreateParameter("@password", adVarWChar, adParamInput,800, password)
            .Parameters.Append .CreateParameter("email", adVarWChar, adParamOutput,800)
            .Execute ,, adExecuteNoRecords
            
            'extract the return value
            isFirstLogin = .Parameters ("RETURN_VALUE")            
            eEmail = .Parameters.Item ("email")      
      End With